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<P><FONT SIZE="5">2.2 Command Line Arguments</FONT><BR>
<P>Following the verb is the body of the command line
which FunnelWeb parses into zero or more
<STRONG>arguments</STRONG> separated by runs of one or more
blanks.
<P>
<PRE>
FunnelWeb_command_line =
FunnelWeb_verb { {" "}+ argument }
</PRE>
<P>Because some operating systems convert their command
line to upper case before handing it to the invoked program,
FunnelWeb has been constructed so as to be
<I>insensitive</I> to the case of its command line
arguments. However, when dealing
internally with arguments, FunnelWeb <I>preserves</I> the
case of its command line arguments so that it will be able
to operate with operating systems (such as
Unix) whose file names are case dependent.
<P>A valid FunnelWeb argument consists of a
<STRONG>sign</STRONG>, an identifying <STRONG>letter</STRONG>,
and an optional <STRONG>string</STRONG> with no spaces
separating them.
<P>
<PRE>
argument = sign id_letter [non_blank_string]
sign = "+" | "-" | "="
id_letter = "B" | "C" | "D" | "F" | "H" | "I" |
"J" | "K" | "L" | "O" | "Q" | "S" |
"T" | "W" | "X"
</PRE>
<P>In addition there is a special form of argument that
does not begin with a sign.
<P>
<PRE>
argument = non_blank_string_not_starting_with_+_=_or_-
</PRE>
<P>This form is exactly equivalent to the same string with
"<TT>+F</TT>" prepended to it.
<P>The semantic effect of these arguments is defined in
terms of <STRONG>options</STRONG> which are the internal
parameters of FunnelWeb and which correspond closely with
the set of legal command line arguments. FunnelWeb has a
predefined set of options each identified by an identifying
letter having two attributes: a <I>string</I> , and a
<I>boolean</I> . The boolean determines whether an option
is turned <I>on</I> or <I>off</I> . The string contains
additional information depending on the option.
<P>When FunnelWeb starts up, its options have predefined
default values. FunnelWeb then parses its command line
sequentially from left to right executing the effect of each
argument on the argument's corresponding option. The sign
and the string components of the argument are processed
<I>independently</I> . A sign of <SAMP>+</SAMP> turns the
option on. A sign of <SAMP>-</SAMP> turns the option off. A
sign of <SAMP>=</SAMP> leaves the option's boolean attribute
unchanged. The argument string replaces the string of the
corresponding option, unless the argument string is empty,
in which case the option string is not changed.
<P>Because FunnelWeb processes its command line arguments
from left to right, a later argument can cancel the effect
of an earlier one. For example <SAMP>fw +t -t</SAMP> will
result in the <SAMP>t</SAMP> option ending up <I>off</I> .
This allows users to set up their own default arguments by
defining a symbol in their operating system's command
language. For example, a Unix user who wants FunnelWeb to
delete all identical output files and create a documentation
file on each run with a default <SAMP>.typ</SAMP> extension
could simply place the following definition in their
"<TT>.login</TT>" file.
<P>
<PRE>
alias fw fw +d +t.typ
</PRE>
<P>These default options can then later be easily
overridden on the command line.
<P>
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